Charging base



FIG. 1 is a top, front and left side perspective view of a charging base showing our new design;

FIG. 2 is a bottom, rear and right side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an enlarged view of portion 9 in FIG. 1 ;

FIG. 10 is an enlarged view of portion 10 in FIG. 1 ;

FIG. 11 is an enlarged view of portion 11 in FIG. 1 ; and,

FIG. 12 is an enlarged view of portion 12 in FIG. 2 .

The broken lines in the drawings illustrate portions of the charging base which form no part of the claimed design. 

CLAIM The ornamental design for a charging base, as shown and described. 